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| Finite element analysis for connecting rod considering oil film lubrication |
| LI Yi-min1, HAO Zhi-yong1, ZENG Xiao-chun2 |
1.College of Energy Engineering, Zhejiang University, Hangzhou 310027, China;
2. Jiangling Motors Limited Corporation, Nanchang 330000, China |
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Abstract Muti-body dynamic model of connecting rod was established and elastic hydrodynamic (EHD) characteristic of big end bearing was studied. Big end bearing loads, oil film thickness and pressure distribution on bearing shell were analyzed. Finite element model of connecting rod was constructed,and stress distribution and deformation under assembly loads were calculated considering contacts of all components. Applying loads to connecting rod through oil film pressure mapping, stress distribution and deformation were analyzed in tension and compression case. Fatigue strength was calculated based on material parameter and processing technology. Results show that the connecting rod is safe and reliable. Connecting rod strength was calculated without considering oil film lubrication, and differences of the two results were analyzed. The strength calculation method considering oil film lubrication is more consistent with the actual working conditions．
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Published: 01 July 2012
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考虑油膜润滑的连杆有限元分析
建立连杆多体动力学模型,研究连杆的弹性液体动力学(EHD)特性,分析大头轴承的载荷、油膜厚度及油膜压力在轴瓦表面的分布.建立连杆有限元模型,考虑各组件间的接触关系,分析连杆在装配载荷下的应力分布及变形.通过油膜压力映射的方法对连杆施加载荷,计算连杆在拉、压2种工况下的应力分布与变形.考虑连杆材料与加工工艺,分析连杆的疲劳强度.结果表明,该连杆安全可靠.通过计算不考虑油膜润滑时的连杆强度,分析2种计算结果的差异.结果表明,考虑油膜润滑的连杆强度计算方法更符合实际工况.
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